PDGFRB pin

FISH

PDGFRB

Alternate Test Names:
PDGFRB rearrangement

Methodology: FISH

Clinical Significance:
Rearrangement of PDGFRB is one of several molecularly defined mechanisms identified in eosinophilia-associated myeloid and lymphoid neoplasms. These neoplasms often present with features similar to chronic myelomonocytic leukemia (CMML), including leukocytosis with anemia and thrombocytopenia, and hypercellular bone marrow with increased reticulin fibrosis. The most common translocation partner is ETV6 [t(5;12)(q33;p13), although more than 20 others have been described. The translocation encodes a constitutively activated tyrosine kinase that responds to imatinib therapy.

Organ: Blood/Bone Marrow

Disease State:

CPT Code(s): 88374

Turnaround Time: Within 3-4 business days of receipt

Schedule: Monday - Friday

Specimen Requirements:
• Peripheral blood, Preferred: 3 ml in sodium heparin (green top) / Acceptable: 3 ml in EDTA (purple top) - OR -
• Bone marrow aspirate, Preferred: 1-2 ml in sodium heparin (green top) / Acceptable: 1-2 ml in EDTA (purple top) - OR -
• Fresh tissue in RPMI